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Post by q8 on Apr 12, 2005 9:53:25 GMT
 Gentelmen. can you tell me the highest known automatic signal number on the combine please? I know the 99x numbers are in the upminster area but are there any higher than 998? Also whats the lowest number you know of? No prizes just curious 
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Post by Harsig on Apr 12, 2005 11:07:37 GMT
Gentelmen. can you tell me the highest known automatic signal number on the combine please? I know the 99x numbers are in the upminster area but are there any higher than 998? Also whats the lowest number you know of? No prizes just curious I think the winner these days must be on the Central Line. I believe the answer is probably A9154 A quick check of some yellow perils shows signal A9153 on the inner rail between Grange Hill and Chigwell while another plan shows the outer rail starter at Chigwell as LLX9154. This latter plan dates from the resignalling of Woodford to Chigwell in May 1997 but prior to the resignalling of Grange Hill in October 1997 and I would imagine that LLX9154 became A9154 when this latter work took place. |
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Post by igelkotten on Apr 12, 2005 13:25:18 GMT
Veering slightly off-topic here, but what are the principles governing signal numbering on the LU network? Do you have any rules on the lines of "the first northbound automatic signal should always have a number in the xx2 sequence, the next one xx4" or anythign similar?
The Stockholm tube principles are so easy that they can get really complicated at times! Basically, the signal number is the signals distance in tens of metres from th zero chaining point of that line, with the three-letter station code for the local interlocking the signal belongs to added. No signals on a single line can have the same number, so there is a certain amount of fiddling with the tens and ones digits. Even-numbered signals always govern northbound trains, odd-numbered govern southbound trains.
Thus, signal SNK800 is the northbound exit signal from platform 1 at Skarpnäck, the southern terminal for line 17. On the other hand, signal ALV819 is the signal governing the exit from Bromma depot and the points leading you either to the southbound tube platform or the arrival track for the trams on Nockebybanan at Alvik station, north of the city.
Normally, we just refer to the signals by their numbers -most of the ones we have to mention are well known, everybody knows where 819 is. When you are doing extensive wrong-direction running, or have a possession between two signals facing outwards from you possession site, the exact placement becomes much more relevant.
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Post by igelkotten on Apr 12, 2005 13:31:46 GMT
Oh, and for a bit of international flavouring to Q8's question: Our highest signal number is probably 2104, which is a signal leading from the sidings south of Norsborg to the platform of the station, which is the southernmost terminus for the red line. There are a few "dwarfs"/fixed red lights in the sidings, too, but I think that they are numbered in the 209x- sequence.
The lowest signal number is signal 013, a signal on the bridge between Gamla Stan and Slussen southbound on the green line. The zero chaining point for the red and green lines is the northern platform edge at Slussen, so that is about as low as you can get.
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Deleted
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Post by Deleted on Apr 12, 2005 14:09:07 GMT
well most of the normal lines if they have a A***0 it usually means its a speed control signal like cannon street w/b A8400 where as the starter which it protects is A840
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Tom
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Signalfel?
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Post by Tom on Apr 12, 2005 17:09:22 GMT
The lowest number is A50, on the Kennington Loop. The numbering scheme is shown on a drawing somewhere (I've only ever seen it once).
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Post by Harsig on Apr 12, 2005 17:33:47 GMT
The lowest number is A50, on the Kennington Loop. The numbering scheme is shown on a drawing somewhere (I've only ever seen it once). A50 may well be the lowest now but there was a time when even lower numbers could be found. Signal A1, for example, could be found on the northbound (local) between Harrow and North Harrow until 27th January 1962 and there may well have been other signals with the same number on other lines that could have survived even longer. |
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Tom
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Signalfel?
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Post by Tom on Apr 12, 2005 20:45:10 GMT
A1 was seen in a few places IIRC, normally after a cabin had been closed but the old signalling remained in use, albiet modified to act as auto signalling. Ruislip springs to mind as an example.
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Gentelmen. can you tell me the highest known automatic signal number on the combine please? I know the 99x numbers are in the upminster area but are there any higher than 998? Also whats the lowest number you know of?
